Roll cleaning device for roller mills



Dec. 27, 1949 F. TANNER ROLL CLEANING DEVICE FOR ROLLER MILLS Filed May18, 1948 Patented Dec. 27, 1949 7 ROLL CLEANING DEVICE FOR- ROLLERIVHLLS Fritz Tanner, St. Gall, Switzerland, assignor to GebriiderBiihler, Uzwil, Switzerland Application May 18, 1948, Serial No. 27,697In Switzerland May 22, 1947 3 Claims.

My invention relates to improvements in delivery-clearing devices onroller-mills for grain and seeds, and the main object of my improvementis to prevent the goods from leaving the crushing gap in the form ofsmall laminae and from sticking in patches to the rollers after havingpassed through the crushing-gap.

A number of delivery clearing-devices on roller-mills have become knownin the prior art, which devices aim to break up or disintegrate thepatches of goods sticking to the rollers when grinding parts of variousgrains and seeds. The ground goods in such prior devices either arecollected in greater quantities, after having passed the rollers, bymeans of special arrangements, or the said devices are built with a viewof subdividing the ground goods, upon delivery from the crushing-gap,into two fine streams without collecting the goods. In thefirst-mentioned type of such prior devices, relatively largerubbing-faces are set up between the rollers and the goods, whereby notonly much grindingfiour or dust is produced, but also the rollers andthe goods are excessively heated. n the other hand, one has notsucceeded in practice-without collecting the goods as set forth-in somounting the knife-beams, rigidly or resiliently, as to prevent theirseizing. Thus, excessive pressures and, consequently, an undesirableexcessive heating of the goods always are set up.

Such disadvantages and drawbacks shall be eliminated by the presentinvention by so adapting a mill beam immediately behind the rollergap,adjustably and resiliently, that only a small goods collecting-space isformed intermediate of the rollers and said beam, and that, further, apassage for a goods-stream each is formed. on either side of said beam.The goods in said space then are detained to such an extent only as toremain loose and to be continuously renewed therein in operation.

One form of invention is shown, by way of example, in the accompanyingdrawing, in which Fig. 1 is a cross-sectional view through the rollersand a clearing-device on line 1-1 of Fig. 2, and

Fig. 2 a diagonal section on line II-II of Fig. 1.

The grinding-rollers of a conventional rollermill are designated by Iand 2, and the goods 3 are ground intermediate thereof. A mill beam 5 isdisposed back of the crushing-gap 4 and is from 3 to 15 millimetersthick, thus forming a relatively small collecting-space 6 for the groundgoods. The latter is detained in said space, and

then delivered in two streams I and 8 disposed on either side of beam 5.The latter, at the two ends of the rollers I and 2, is supported on twoset-screws 9 and, at its rear end on one arm of a rockable bell-cranklever Ill pivoted to the lateral standards of the roller-mill. The beam5 at one end is provided with a rear knife-edge, which is received in anotch I2 of the abuttingarm of bell-crank I0, whilst at the other end itabuts against a face I3 of said arm, such face being indicated by adotted line. The other arm of bell-crank I0 is biased by a helicalspring I4, the other end of which is secured to a second set-screw I5.By adjusting the latter the tension of spring I4 may be regulated. Thelatter tends to pull bell-crank lever I0 up against two stopscrews I6(one at each end of the mill frame) which are so set that the edges ofbeam 5 adjacent the rollers I, 2 are equally spaced over their entirelength, from the said rollers, thus affording substantially equaldelivery-gaps for the goodsstreams I and 8. Due to the resilience ofbellcrank I 0, the ground goods in the collection space 6 are detainedto such extent only as to remain loose and to be continuouslyreplenished in operation.

I claim:

1. A device on roller-mills for grains and seeds adapted to prevent thegoods from leaving the crushing gap in the shape of small laminas andfrom sticking in patches to the rollers, comprising a mill beam looselymounted to the rear of the crushing-gap between the rollers andextending over the entire length of the latter, the forward edge of saidbeam projecting upwardly into said gap so as to leave a comparativelysmall space between said gap and rollers and a delivery-gap on eachflank of said edge between the rear end of said space and said rollers,springloaded rockable abutting-means for the two lateral rear ends ofsaid beam, a set-screw at each lateral end of said beam for freelysupporting the latter on its Web, and an adjustable stopscrew acting oneach said abutting-means for adjusting the throw of the latter; thewhole in such combination as to permit to detain the ground goods in thesaid space in loose condition and to continuously replenish same inoperation.

2. A delivery clearing-device on roller-mills as set out in claim 1, andin which the two lateral ends of the mill beam are adapted as knifeedgeswhich abut against the said abuttingmeans.

3. A delivery clearing-device on rolleremills as 3 set out in claim 1,and in which the mill-beam Number forward edge which co-operates withthe said 314,278 space has a thickness of from three to fifteen 691,582millimeters. 1,144,802 FRITZ TANNER. 5 1,729,515 1,930,873 REFERENCESCITED 2,194,511 The following references are of record in the file ofthis patent: v

m Number UNITED STATES PATENTS 313,686 Number Name Date 209,829 NemelkaNov. 12, 1878 Name Date Warrington Mar. 24, 1885 Beam Jan. 21, 1902Warren June 29, 1915 MacCallum Sept. 24, 1929 Brewster Oct. 17, 1933Sonsthagen Mar. 26, 1940 FOREIGN PATENTS Country Date Germany July 16,1919

